Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 90mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke90 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-50S
The AirTAC SAIJ40X90-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 40 to 90 mm, letting you dial back the 90 mm nominal stroke by up to 50 mm during commissioning without adding external stops. In the 40 mm bore class, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa.
This unit includes a SUS304 stainless steel rod for corrosion resistance and carries a magnetic piston for position sensing. You can mount AirTAC CMSE reed or DMSE electronic sensors in the dual-side barrel grooves. The rear adjuster functions strictly as a travel stop for end-position tuning, not as a load lock.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 90 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 30 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×90 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-50S Is Used
Machine Changeover
Fine-tune the 40 to 90 mm travel window to accommodate different product sizes on a packaging line without physically swapping cylinders.
Variable End Stops
Use the 50 mm rear adjustment range to set precise retract positions during machine setup, avoiding the need for external stopper blocks.
Position Verification
Leverage the integrated magnet with DMSE electronic sensors to confirm exact end-of-stroke positions after adjusting the travel limits.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-50S the Right Cylinder?
Choose this 40 mm bore when your application needs around 628 N push force at 0.5 MPa. If you require less force, step down to the 32 mm bore offering 402 N. If your setup demands more thrust, step up to the 50 mm bore providing 982 N. The adjustable stroke is selected over a fixed SAI cylinder when you need variable end-stops for product changeovers. To match this ISO 15552 cylinder, specify a 40 mm bore, 90 mm stroke, 50 mm adjustment, PT tapered port, and a magnet (-S). Because the nominal stroke is under 300 mm, side-load risks are minimal, though long unsupported rods still need an external guide.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX90-50S FAQ
At 0.5 MPa it provides 628 N push and 528 N pull force. At 0.7 MPa the push force is 879 N, and it reaches 1130 N at 0.9 MPa.
The rear adjuster lets you shorten the 90 mm nominal stroke by up to 50 mm, creating a usable travel window of 40 to 90 mm for exact end-position tuning without replacing the cylinder.
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